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Guo Chen - One of the best experts on this subject based on the ideXlab platform.

  • Efficient improvement for dissociation behavior and thermal decomposition of Manganese Ore by microwave calcination
    Journal of Cleaner Production, 2020
    Co-Authors: Jin Chen, Jinhui Peng, Mamdouh Omran, Guo Chen
    Abstract:

    Abstract Traditional smelting process of Manganese Ore was plagued with high consume of power and coke, and spraying and slag turning accidents caused by violent decomposition of carbonates and Manganese oxides in Manganese Ore. In the present work, the thermal decomposition mechanism and phase structures of Manganese Ore were systematically investigated, calcined through microwave calcination approach and characterized by XRD, SEM and EDAX. Results indicated that microwave calcination had a significantly better effect than conventional calcination for Manganese Ore. An increase in calcination temperature was found to present a mOre profound effect than calcination duration. The optimum calcination temperature was identified to be 950 °C, with the calcination duration being 30 min, and Manganese Ore grade increased from initial 30% to 39%–42%, with the pulverization ratio being 8%–9%. Peak intensities of Mn3O4 phase enhanced with calcination temperature increasing, and irregular cracks and pits appeared on the surface of the microwave calcined Manganese Ore. Meanwhile, the feasibility of decomposition reactions of Manganese Ore at the considered temperature regime was confirmed by thermodynamics analysis. The upgrading and modified Manganese Ore by microwave calcination can realize the direct smelting of the concentrate. The work proposes an efficient calcination idea for Manganese Ore by microwave calcination.

  • Modeling and kinetics study of microwave heat drying of low grade Manganese Ore
    Advanced Powder Technology, 2020
    Co-Authors: Lei Gao, Jin Chen, Mamdouh Omran, Yong Yang, Shenghui Guo, Guo Chen
    Abstract:

    Abstract During the industrial-scale smelting process of Manganese Ore, blast may occur due to the high moisture content of the Ore, and drying pretreatment of the Manganese Ore is needed in the aspects of safety. In the present paper, microwave drying experiments were conducted under different particle size distributions and different microwave power conditions to explOre the basic theory of microwave drying characteristics and kinetics of Manganese Ore, and the experimental data were fitted and analyzed by using thin-layer drying dynamics model. Results indicated that with the increase of the particle size and the microwave power of the Manganese Ore, the microwave drying rate increased, and accompanied with a promoting on the drying efficiency. For describing the microwave drying process of Manganese Ore, diffusion approach model was adopted among the commonly used thin-layer drying kinetic models. Based on Fick's second law, it can be seen that the surface diffusion coefficient increased from 4.27 × 10−13 m2/s to 8.24 × 10−8 m2/s with the increase of particle size from a particle size range of 0.012–0.095 mm to a particle size range of 4.2–5.0 mm. Clearly, the particle size has a significant influence on microwave drying efficiency.

  • microwave dielectric properties and thermochemical characteristics of the mixtures of walnut shell and Manganese Ore
    Bioresource Technology, 2019
    Co-Authors: Jin Chen, Jinhui Peng, Guo Chen, Roger Ruan, C Srinivasakannan
    Abstract:

    Abstract In this work, dielectric properties and thermochemical characteristics of mixtures of walnut shell and Manganese Ore were systematically investigated. Results indicated that reducing Manganese Ore by walnut shell was divided into four stages identified by temperatures:

  • Rapid thermal decomposition of Manganese Ore using microwave heating
    Journal of Alloys and Compounds, 2017
    Co-Authors: Jin Chen, Jinhui Peng, Guo Chen, Chandrasekar Srinivasakannan
    Abstract:

    Abstract The present work attempts to investigate the influence of microwave heating on thermal decomposition and dissociation behavior of Manganese Ore. The Manganese Ore could be rapidly heated volumetrically to 1000 °C in 17 min by microwave heating, with an increase in Manganese content of the Ore from 30% to 40%. XRD patterns and thermodynamic analysis shows that the process of microwave heating could be divided into three parts, namely the decomposition reaction of MnCO 3 , Mn 2 O 3 and CaCO 3 , respectively. Mn 3 O 4 were obtained at microwave calcination temperatures higher than 577 °C. Based on the results, microwave heating can be applied effectively and efficiently for pretreatment of Manganese Ore.

  • Effects of microwave heating on microstructures and structure properties of the Manganese Ore
    Journal of Alloys and Compounds, 2016
    Co-Authors: Guo Chen, Zuohua Liu, Changyuan Tao, Nanxiong Chen, Jinhui Peng
    Abstract:

    Abstract The present work attempts to investigate the formation–decomposition reaction of the Manganese Ore. Thermodynamic analysis indicates that the decomposition reaction of the Manganese Ore was feasible by adjusting the roasting temperature and duration time. The peak intensity of Mn3O4 phase of the microwave heated products increases with the increase of microwave heating temperature. The microwave treated Manganese Ore appears irregular with numerous small cracks and pits, which was caused by the decomposition reaction of MnCO3 phase and CaCO3 phase under microwave heating. It was concluded that microwave heating can be applied effectively and efficiently to the calcination processes of the Manganese Ore.

Jinhui Peng - One of the best experts on this subject based on the ideXlab platform.

  • Efficient improvement for dissociation behavior and thermal decomposition of Manganese Ore by microwave calcination
    Journal of Cleaner Production, 2020
    Co-Authors: Jin Chen, Jinhui Peng, Mamdouh Omran, Guo Chen
    Abstract:

    Abstract Traditional smelting process of Manganese Ore was plagued with high consume of power and coke, and spraying and slag turning accidents caused by violent decomposition of carbonates and Manganese oxides in Manganese Ore. In the present work, the thermal decomposition mechanism and phase structures of Manganese Ore were systematically investigated, calcined through microwave calcination approach and characterized by XRD, SEM and EDAX. Results indicated that microwave calcination had a significantly better effect than conventional calcination for Manganese Ore. An increase in calcination temperature was found to present a mOre profound effect than calcination duration. The optimum calcination temperature was identified to be 950 °C, with the calcination duration being 30 min, and Manganese Ore grade increased from initial 30% to 39%–42%, with the pulverization ratio being 8%–9%. Peak intensities of Mn3O4 phase enhanced with calcination temperature increasing, and irregular cracks and pits appeared on the surface of the microwave calcined Manganese Ore. Meanwhile, the feasibility of decomposition reactions of Manganese Ore at the considered temperature regime was confirmed by thermodynamics analysis. The upgrading and modified Manganese Ore by microwave calcination can realize the direct smelting of the concentrate. The work proposes an efficient calcination idea for Manganese Ore by microwave calcination.

  • microwave dielectric properties and thermochemical characteristics of the mixtures of walnut shell and Manganese Ore
    Bioresource Technology, 2019
    Co-Authors: Jin Chen, Jinhui Peng, Guo Chen, Roger Ruan, C Srinivasakannan
    Abstract:

    Abstract In this work, dielectric properties and thermochemical characteristics of mixtures of walnut shell and Manganese Ore were systematically investigated. Results indicated that reducing Manganese Ore by walnut shell was divided into four stages identified by temperatures:

  • Rapid thermal decomposition of Manganese Ore using microwave heating
    Journal of Alloys and Compounds, 2017
    Co-Authors: Jin Chen, Jinhui Peng, Guo Chen, Chandrasekar Srinivasakannan
    Abstract:

    Abstract The present work attempts to investigate the influence of microwave heating on thermal decomposition and dissociation behavior of Manganese Ore. The Manganese Ore could be rapidly heated volumetrically to 1000 °C in 17 min by microwave heating, with an increase in Manganese content of the Ore from 30% to 40%. XRD patterns and thermodynamic analysis shows that the process of microwave heating could be divided into three parts, namely the decomposition reaction of MnCO 3 , Mn 2 O 3 and CaCO 3 , respectively. Mn 3 O 4 were obtained at microwave calcination temperatures higher than 577 °C. Based on the results, microwave heating can be applied effectively and efficiently for pretreatment of Manganese Ore.

  • Effects of microwave heating on microstructures and structure properties of the Manganese Ore
    Journal of Alloys and Compounds, 2016
    Co-Authors: Guo Chen, Zuohua Liu, Changyuan Tao, Nanxiong Chen, Jinhui Peng
    Abstract:

    Abstract The present work attempts to investigate the formation–decomposition reaction of the Manganese Ore. Thermodynamic analysis indicates that the decomposition reaction of the Manganese Ore was feasible by adjusting the roasting temperature and duration time. The peak intensity of Mn3O4 phase of the microwave heated products increases with the increase of microwave heating temperature. The microwave treated Manganese Ore appears irregular with numerous small cracks and pits, which was caused by the decomposition reaction of MnCO3 phase and CaCO3 phase under microwave heating. It was concluded that microwave heating can be applied effectively and efficiently to the calcination processes of the Manganese Ore.

Jin Chen - One of the best experts on this subject based on the ideXlab platform.

  • Efficient improvement for dissociation behavior and thermal decomposition of Manganese Ore by microwave calcination
    Journal of Cleaner Production, 2020
    Co-Authors: Jin Chen, Jinhui Peng, Mamdouh Omran, Guo Chen
    Abstract:

    Abstract Traditional smelting process of Manganese Ore was plagued with high consume of power and coke, and spraying and slag turning accidents caused by violent decomposition of carbonates and Manganese oxides in Manganese Ore. In the present work, the thermal decomposition mechanism and phase structures of Manganese Ore were systematically investigated, calcined through microwave calcination approach and characterized by XRD, SEM and EDAX. Results indicated that microwave calcination had a significantly better effect than conventional calcination for Manganese Ore. An increase in calcination temperature was found to present a mOre profound effect than calcination duration. The optimum calcination temperature was identified to be 950 °C, with the calcination duration being 30 min, and Manganese Ore grade increased from initial 30% to 39%–42%, with the pulverization ratio being 8%–9%. Peak intensities of Mn3O4 phase enhanced with calcination temperature increasing, and irregular cracks and pits appeared on the surface of the microwave calcined Manganese Ore. Meanwhile, the feasibility of decomposition reactions of Manganese Ore at the considered temperature regime was confirmed by thermodynamics analysis. The upgrading and modified Manganese Ore by microwave calcination can realize the direct smelting of the concentrate. The work proposes an efficient calcination idea for Manganese Ore by microwave calcination.

  • Modeling and kinetics study of microwave heat drying of low grade Manganese Ore
    Advanced Powder Technology, 2020
    Co-Authors: Lei Gao, Jin Chen, Mamdouh Omran, Yong Yang, Shenghui Guo, Guo Chen
    Abstract:

    Abstract During the industrial-scale smelting process of Manganese Ore, blast may occur due to the high moisture content of the Ore, and drying pretreatment of the Manganese Ore is needed in the aspects of safety. In the present paper, microwave drying experiments were conducted under different particle size distributions and different microwave power conditions to explOre the basic theory of microwave drying characteristics and kinetics of Manganese Ore, and the experimental data were fitted and analyzed by using thin-layer drying dynamics model. Results indicated that with the increase of the particle size and the microwave power of the Manganese Ore, the microwave drying rate increased, and accompanied with a promoting on the drying efficiency. For describing the microwave drying process of Manganese Ore, diffusion approach model was adopted among the commonly used thin-layer drying kinetic models. Based on Fick's second law, it can be seen that the surface diffusion coefficient increased from 4.27 × 10−13 m2/s to 8.24 × 10−8 m2/s with the increase of particle size from a particle size range of 0.012–0.095 mm to a particle size range of 4.2–5.0 mm. Clearly, the particle size has a significant influence on microwave drying efficiency.

  • microwave dielectric properties and thermochemical characteristics of the mixtures of walnut shell and Manganese Ore
    Bioresource Technology, 2019
    Co-Authors: Jin Chen, Jinhui Peng, Guo Chen, Roger Ruan, C Srinivasakannan
    Abstract:

    Abstract In this work, dielectric properties and thermochemical characteristics of mixtures of walnut shell and Manganese Ore were systematically investigated. Results indicated that reducing Manganese Ore by walnut shell was divided into four stages identified by temperatures:

  • Rapid thermal decomposition of Manganese Ore using microwave heating
    Journal of Alloys and Compounds, 2017
    Co-Authors: Jin Chen, Jinhui Peng, Guo Chen, Chandrasekar Srinivasakannan
    Abstract:

    Abstract The present work attempts to investigate the influence of microwave heating on thermal decomposition and dissociation behavior of Manganese Ore. The Manganese Ore could be rapidly heated volumetrically to 1000 °C in 17 min by microwave heating, with an increase in Manganese content of the Ore from 30% to 40%. XRD patterns and thermodynamic analysis shows that the process of microwave heating could be divided into three parts, namely the decomposition reaction of MnCO 3 , Mn 2 O 3 and CaCO 3 , respectively. Mn 3 O 4 were obtained at microwave calcination temperatures higher than 577 °C. Based on the results, microwave heating can be applied effectively and efficiently for pretreatment of Manganese Ore.

Kulamani Parida - One of the best experts on this subject based on the ideXlab platform.

  • Studies on sulphatization—I. Sulphatization of Manganese Ore with pyrite
    Journal of Chemical Technology & Biotechnology, 2007
    Co-Authors: Binod Bihari Nayak, Kulamani Parida
    Abstract:

    The sulphatization of low grade Manganese Ore with iron pyrites has been studied. The effect of reaction period, temperature, ratio of Manganese to sulphur, particle size, surface area and packing density was investigated and the extent of sulphatization was reported as recovery of Manganese sulphate. Under optimum heating time of 2 h at 600°C with finely powdered (−150±200 mesh BSS pyrite and −300±325 mesh Manganese Ore) reactants, the conversion to Manganese sulphate was 82%.

Chandrasekar Srinivasakannan - One of the best experts on this subject based on the ideXlab platform.

  • Rapid thermal decomposition of Manganese Ore using microwave heating
    Journal of Alloys and Compounds, 2017
    Co-Authors: Jin Chen, Jinhui Peng, Guo Chen, Chandrasekar Srinivasakannan
    Abstract:

    Abstract The present work attempts to investigate the influence of microwave heating on thermal decomposition and dissociation behavior of Manganese Ore. The Manganese Ore could be rapidly heated volumetrically to 1000 °C in 17 min by microwave heating, with an increase in Manganese content of the Ore from 30% to 40%. XRD patterns and thermodynamic analysis shows that the process of microwave heating could be divided into three parts, namely the decomposition reaction of MnCO 3 , Mn 2 O 3 and CaCO 3 , respectively. Mn 3 O 4 were obtained at microwave calcination temperatures higher than 577 °C. Based on the results, microwave heating can be applied effectively and efficiently for pretreatment of Manganese Ore.